People in Japan are crazy about 'Naruto the movie: Road to Ninja' right now, since Kishimoto is the one who's written and designed this movie.
The storyline is somewhat canon, he intended to show us some things that he has lost the right timing to show them in the manga, eg. Sakura's parents.
So, basically this week he wants to add an additional chapter that's relate to the up-coming movie and might relate to the current storyline of the manga too.
Be patience everyone, this week in Japan is just crazy!!
UPDATE: Oh, it's finally came out earlier than I thought! Thanks, Uchiha_Blood kun for providing the link. =)